Siemens SIPROTEC 7SJ80

EPTR/TNP Tripping Time Characteristic
[7SJ80_knickpkt-kennlinie, 1, en_US]
Figure 4-11
Tripping Time Characteristic Curves of the Inverse-Time Ground-Fault Protection with Loga-
rithmic-Inverse Knee-Point Characteristic Curve, Example EPTR
EPTR Trip Time characteristics
for a primary short circuit current between:
0.5 A; 6 A
t = 88.1 x (Ir)
-2/3
Maximum Tolerance
t
+
= 105.7 x (Ir)
-2/3
Maximum Tolerance
t
-
= 70.5 x (Ir)
-2/3
6 A; 80 A
t = 160 x (Ir)
-1
Maximum Tolerance
t
+
= 203.7 x (Ir)
-1.034
Maximum Tolerance
t
-
= 118.3 x (Ir)
-0.956
80 A; 200 A
t = 160 x (Ir)
-1
Maximum Tolerance
t
+
= 175.8 x (Ir)
-1.000
Maximum Tolerance
t
-
= 143.9 x (Ir)
-1.000
200 A; 300 A t = 0.80
Maximum Tolerance
t
+
= 0.88
Maximum Tolerance
t
-
= 0.72
300 A; 1000 A t = 0.80
Maximum Tolerance
t
+
= 0.58 x (Ir)
-0.073
Maximum Tolerance
t
-
= 1.26 x (Ir)
-0.098
Technical Data
4.14 Ground Fault Detection (Sensitive/Insensitive)
SIPROTEC 4, 7SJ80, Manual 399
E50417-G1140-C343-A8, Edition 12.2017